Most Hong Kong residents want their government to do a better job tackling environmental problems, according to a survey released over the weekend by Civic Exchange, a public policy think tank. More than 60 percent of the 960 respondents said issues such as pesticides in foods, contaminated seafood, and air and water pollution should be a top priority of the government. Fifty-five percent said they were unhappy with how the government had acted on pollution problems so far. Ninety-two said they would support tougher penalties for littering, while 33 percent admitted they littered because the city was already dirty. Only 19 percent cited environmental problems in mainland China as a concern, even though much of Hong Kong’s drinking water comes from China.